Move the new render symbols to dixsym.c instead so they are grouped with

the other render symbols.
Initialize screen_x and screen_y to 0. This fixes a problem with the new
    Damage based sprite, where intersection test against the root pixmap
    would fail because the two fields were not initialized (damage.c,
    166-170).

fb/fbpixmap.c

@@ -73,6 +73,11 @@ fbCreatePixmapBpp (ScreenPtr pScreen, int width, int height, int depth, int bpp)
     fbInitializeDrawable (&pPixmap->drawable);
 #endif
 
+#ifdef COMPOSITE
+    pPixmap->screen_x = 0;
+    pPixmap->screen_y = 0;
+#endif
+
     return pPixmap;
 }